Feeding mechanism for grinding-machines.



PATENTED MAY 26, 1908.

I. N. HEALD.

FEEDING MECHANISM FOR GRINDING MACHINES.

APPLICATION FILED MAY 9, 1906 2 SHEETS-SHEET 1.

Figi- \A flznesses Q6 TWi $758 31B 6 z MW. 9

kg Inv enior No. 888,496. PATENTED MAY 26, 1908.

J. N. HEALD.

FEEDING MECHANISM FOR GRINDING MACHINES.

APPLICATION FILED MAY 9, 1906.

2 SHEETS-SHEET 2. I

[mill/[III]IIIIIIIIIIIIIIIIIIII/IIIIIIIIIWI 51 i 55 F fin I InventorWfinesses r r I v I corneg I ing the grinding wheel to the work.

mechanism for that UNITED. STATES PATENT oF roE,

JAMES N. HEALD, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO THE HEALDMACHINE COMPANY, OF WORCESTER, MASSACHUSETTS, A CORPORATION OFMASSACHUSETTS.

FEEDING MECHANISM FOR GRINDING-MACHINES.

Specification of Letters Patent.

Patented May 26, 1908.

Application filed May 9, 1906. Serial No. 315,885.

To all whom it may concern:

Be it known that 1, JAMES N. HEALD, a citizen of the United States,residing at 'orcester, in the county of \Vorcester and Commonwealth ofMassachusetts, have invented a new and useful Improvement in'a FeedingMechanism for Grindingdlachines, of which the following is aspecification, accompanied by drawings forming a part of the same, inwhich Figure 1 is a front elevatiomof a grinding machine embodying myinvention. Fig. 2 is a sectional view on line 22, Fig. 1, through thefeeding mechanism for advanc- Fig. 3 is a detached, and sectional viewof a portion of the feeding mechanism. Fig. 4 is a lon itudinalsectional. central view through tie head of the machine. Fig. 5 is adetached isometric'view of the device for actuating the star wheel ofthe feeding mechanism, and Fig. 6 is a to view'of the blade spring forreversing thes iding spindle 29.

Similar reference letters and figures refer to similar parts in thedifferent views.

My present invention relates to a feeding class'of grinding machinesdesigned for'grinding internal cylindrical surfaces, in which arevolving grinding wheel is given an orbital movement around a fixedcenter, whereby the peri hery of the grinding wheel is moved 'arounc thesurface of the work insteadof revolvin the work around a grinding wheelwhlc revolves about a fixed axis. Grinding machines of this type aree'spccially'adaptcd to a great variety of work in which it isinconvenient to revolve the workabout the grinding wheel.

In grinding machines of this class the grinding wheel is carried upon arapidly revolving arbor journaled eccentric-ally in a sleeve held thespindle of the in a rotating cylinder, journaledin the head of themachine. As the cylinder is rotated grinding wheel is carried around ina circular path whose diameter is determined by the eccentricity of theaxis of the spindle: to the axis of therotating cylinder. The eccentricsleeve carrying the grindmg wheel spindle 1s provided with a feedinmechanism by which it ma be rotat-ed within the cylinder, in order tovary the eccentricity of the grinding wheel spindle relatively tothcrotating cylinder and thereby increase or diminish the diameter of thecircular path through which the axis of the grinding Wheel spindle movesas the cylinder is rotated.

By means of the feeding mechanism the circular path or orbital movementof the grinding wheel can be varied to adapt the grinding wheel to theinternal diameter of the surface to be ground, and when the 0 )er tionof the grinding is in progress the fee mg mechanism enables the grindingwheel to be K moved outward to compensate for the Wear I of the wheel,and to bring the ground surface to the desired diameter.

My present invention relates to the feeding mechanism by which theeccentricity of the grinding wheel is varied relatively to the rotatingcylinder and it has for its object to enable the operator to quicklychange the eccentricity of the grinding wheel;-to secure an accuratead'ustment of the grindin and to facilitate the grinding of uphcatework, and these objects I accomplish by means of the construction andarrangement of parts as hereinafter described and pointed out in theannexed claims.

Referring to the accompanying drawmgs, 1 denotes the supportingframework of a grinding machine, upon which are mounted bearings 2 and 3for a rotat ng cylinder 4, carrying a gear wheel 5 which is engaged byapin-ion 6 upon a shaft 7, carrying a step pulley 8 which is driven'froma pulley 9 on a countershaft at the base of the mach ne. Journaledeccentricallyin the cylinder 4 IS a sleeve 10, provided at one end wltha tubular SlOIl 11 is journaled a revolving spindle 12,

carrying on one end a grinding wheel 13 and at the opposite end a beltpulley 14.

The Work to be ground is supported upon a table 15 on a bed 16 to whicha traversmg motion is given by means of suitable mechanism, such as iscommonly used 1n machines of this class to impart a traversing motion tothe work. The grinding wheel 13 is inserted Within the work to be groundand is rapidly rotated by the belt pulley 14, while a slow orbitalmovement is given to the grinding wheel by the rotation of the cylinder4. Tl 1e sleeve 10 is capable of being turned within the cylinder 4 inorder to vary the eccentricity of the spindle 12 to the axis of thecyhnder 4, and this adjustment of the sleeve 10 1s accoln lished by afeeding mechanism which embo ies my present invention.

Attached to the sleeve 10 is a Worm gear 1 7 Wheel,

engaged by a worm 18 on a shaft 19, having a geared connection with aparallel shaft 20 which carriesv a star wheel 21, which is frictionallyheld from accidental turning by within a casing 28, both of which areating and a longitu inal movement.

tached to the rotating cylinder 4, causing the feeding mechanism to becarried around by the cylinder 4. Held-in the framework of the machineis a s indle 29 capable of a'roek- One end of the spindle carries alever handle 30 and the opposite end carries a radial arm- 31, on theouter face of which projects a longitudinal rib 32, one end 33 of saidrib being substantially coincident with the axis of, the rocking spindle29. The lever handle 30 is rovided with a radial projecting wing 34,having two recesses 35 and 36 adapted to alternately receive the end ofa pin 37 carried by a blade spring 38, attached at one end to theframework of the machine, and having its opposite end 39 projectingbeyond the framework to form a convenient handle to enable the pin 37 tobe retracted.

The tension of the spring 38 not only looks the spindle 29 againstrotation, but also holds' the radial arm 31 against the framework, withthe projecting rib 32 normally out of the path of the star wheel 21 asthe latter is carried around the axis of the cylinder 4. By lifting thepin 37 out of engagement with the wing 34, the spindle 29 may beslightly rocked so as to bring the pin into the other notch and vary theposition of the ra-,

dial arm 31, from the osition shown in full lines in Fig. 2 to thatshown by broken lines 40, for the purpose of reversing the movement ofthe feeding mechanism.

In the osition of the radial arm 31 as shown in l igs. 2 and 5, theprojecting rib 32 is slightly eccentric to the axis of the rotatingcylinder 4, sufiiciently to cause the star wheel to be turned the spaceof one tooth as it passes the rib 32, causing a slight movement of thesleeve 10 to increase the eccentricity of the spindle 12 to the axis ofthe rotating cylinder 4, thereby carrying the grinding wheel slightlyoutward. The projection 32 is brought 'into the path of the star wheelby the operator moving the spindle 29 longitudinally against the tensionof the blade s ring 38 by means of the lever handle 30, an holding it inposition until the star wheel passes by the rojection 32. Each passageof the star w eel by the projecting nb 32 is arranged to carry theperiphery of the grinding wheel outward about .00025 of an inch. Whenthe first The-shaft 20 is propiece of work has heen accurately ground asmay be determined by calipering, the eccentricity of the grinding wheelspindle 12 is determined by means of a graduated index disk 41,frictionally held on the shaft 19 and capable of being turned under thefixed index point 42. When the grinding is completed the index disk 41is set at zero. The grinding wheel is then moved toward the center ofthe rotating cylinder 4 to be inserted in the succeeding piece of workand the grinding of the second piece may be continued withoutinterruption for calipering until the index disk returns to zero. Theinterior surface ground will then be of the correct size, varying only aslight amount due to the wear of the wheel while grinding.

The squared end 26 of the shaft 19 enables a quick feeding movement tobe imparted to the grinding Wheel by means of a wrench handle, and afine adjustment of the grinding wheel may be obtained independently ofthe projecting rib 32 by means of the hand wheel 25.

I claim,

1. In a grinding machine of the class described, the cornblnation of arotating cylinder, a revolving grinding wheel spindle journaledeccentricallywithin said rotating cylinder, a star wheel carried in acircular path by said cylinder, a projection held in the fixed frameworkof the machine in the path of said star wheel, whereby an intermittentmotion is given to said star wheel at each r0- tation of said cylinder,and a feeding mechanism operatively connected with said star wheel forvarying the eccentricity of said grinding wheel spindle.

2. In a grinding machine of the class de scribed, a feeding mechanismfor varying the orbital path of the grinding wheel, consisting of arotating star wheel carried in a circular path concentric with theorbital path of the grinding wheel spindle, means for operativelyconnecting said star wheel and said grinding wheel spindle, and meansfor imparting an intermittent motion at will to said star wheel duringits concentric movement.

3. In a grinding machine of the class described, a feeding mechanism forvarying the orbital path of the grinding wheel spindle,

comprising a star wheel having a circular movement around a fixed axis,and a projection held in the framework of the machine capable of beingmoved at will into the path of said star wheel. I

4. In a grinding machine of the class de-.

scribed, a rotating member for carrying the grinding wheel spindle in anorbital path con centric with the axis of said rotat ng mem-. ber, meansfor var ing the eccentricity of the grinding wheel spmdle relatively tosaid ro-. tating member, comprising a star wheel carried by the rotatingmember, and a projection held in the framework of the machine capable ofbeing'moved into and out of the path of said star wheel.

5. In a grinding machine of the class described, a feeding mechanism forvarying the,

orbital movement ofthe grindin wheel spindle, and comprising a starwhee? circular path corresponding with the orbital movement of thegrinding Wheel spindle a projecting rib supported by the framework ofthe machine, and means for bringing said rib at willinto position toengage the teeth ofsaid star wheel.

6. In a grinding machine of the class described, a rotating cylindercarrying therinding wheel spindle, a'feeding mechanism or varying theorbital path of the grinding wheel spindle, and comprising a star Wheel,

said feeding mechanism being carried in a.

circular path by said rotating cylinder, a spindle journaled in theframework of the machine, a radial arm carried by said spindle, aprojecting rib" on said arm arranged to engage the teeth of-said starwheel, means for rocking said spindle, and means for looking saidspindle.

7. In a grinding machine of the class described, a rotating cylindercarrying a grinding wheel spindle, a feeding mechanism carried by saicylinder and comprising a star wheel, a projecting rib arranged toengage the teeth of said star Wheel as said cylinder rotates, and meansfor changin the position of said rib in order to reverse t e movement ofthe star wheel.

carried in a' l on itudinal movement therein, a radial arm hel on-saidspindle, a projecting rib on said arm, means for slidingsaid spindle tobring said rojecting rib into the path of said star whee a a p g orreversing the motion of'said spindle. e

9. In a grinding machine of the class described, the combination ofa.rot.ating cylinder, a sleeve journaled eccentrically in said cylinder,a grlnding Wheel spindle journaled eccentrically in said sleeve, aframework carried by said cylinder, a feeding mechanism carried by saidframework operatively connected with said sleeve, and comprising a starwheel carried by said framework in a circular path concentric with thepath of the grinding Wheel spindle, a projection held in the fixedframework of the machine in the path of said starwheel, a graduated diskcapable of bein rotated by said feeding mechanism and a ed index finger.I

Dated this first day of May 1906.

, JAMES N. EALDQ I Witnesses:

RUFUS FOWLER, PENELOPE COMBERBACH.

